Examine source code of TabSwitcher

{
  "description": "标签页切换小工具,使用Alt+Num切换到对应的标签页上",
  "manifest_version": 2,
  "name": "TabSwitcher",
  "version": "1.1",
  "homepage_url": "https://github.com/sidian123/TabSwicher",
  "icons": {
    "48": "icons/beasts-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}